Officials said the man, who is believed to be in his 50s, was stabbed on 23rd Street and then walked down the street bleeding and yelling for help.

"He just said, 'help me, help me, help me,'" said neighbor Wayne Wilks. "He was screaming all the way down the street. He just collapsed down the floor. He was bleeding everywhere."

The victim lived in a shed behind a house on 23rd Street and Lee Avenue.

Orange County sheriff investigators said a man came to the victim's shed, knocked on the door and asked him for a cigarette. When no cigarette was produced, the man stabbed the victim multiple times all over his body, authorities said.

"According the victim, a black male not known to him approached his home, knocked on door," said Orange County Sheriff's Office spokeswoman Ginette Rodriguez. "They victim answered the door and suspect asked him for cigarettes. When the victim could not produce cigarettes, he proceeded to stab him."

The Orange County Fire Department said they responded to calls about the man at about 9 a.m. He was found lying in the street and had multiple stab wounds to the chest.

Officials said the man who stabbed the victim took off on his bicycle.

Investigators said they have limited information about the attacker.

"The only information that we have at this point is that it was a black male, about 5 feet 11 inches tall, bald and he had taken off on the victim's bicycle," said Rodriguez.

The victim is in critical but stable condition at Orlando Regional Medical Center.

A law enforcement official tells The Associated Press that a Justice Department investigation has found patterns of racial bias in the Ferguson, Missouri, police department and at the municipal jail and court.